Telephone-exchange system.



J. L. WRIGHT. TELEPHONE EXCHANGE SYSTEM.

AIPLICATION FILED NOV. II. I912- Patemed Dec. 11, 1917.

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J. L. WRIGHT.v TELEPHONE EXCHANGE SYSTEM.

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APPLICATION FILED NOV- H. I912.

. .I. L. WRIGHT. TELEPHONE EXCHANGE SYSTEM.

APPLICATION FILED NOV. 11, I912.

' Patented Dee. 11,1917.

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Patented Dec; 11,1917.

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I. L. WRIGHT. TELEPHONE EXCHANGE SYSTEM.

APPLICATION FILED NOV- II. 1912- 'Patentedl Dec 11.1, 1917.

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J. L. WRIGHT.

TELEPHONE EXCHANGE SYSTEM. APPLICATION men NOV- ll, m2.

Patented Dec; H, 191?.

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J. L,- WRIGHT. TELEPHONE EXCHANGE SYSTEM. APPLICATION mm NOV. II. 1912;

Patented Dec.11,1917.

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1. L. WRIGHT.

IELEPHONE EXCHANGE SYSTEM. APPLICATION FltED NOV. :1. 1912.

Patented Dec; 11, 191?.

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.l. L. WRIGHT.

TELEPHONE EXCHANGE SYSTEM.

APPLICATION FILED NOV-11,1912.

Patanted Dec, 111, 1911?.

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TELEPHONE EXCHANGE SYSTEM.

' APPLICATION FILED Nov. II. 1912.

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Patented Dec, 11,1917.

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fig 6a J. L. WRIGHT.

TELEPHONE EXCHANGE SYSTEM.

APPLICATION FILED NOV- H v Patented Dec. 11,1917.

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J. L. WRIGHTv TELEPHONE EXCHANGE SYSTEM.

APPLICATION FILED NOV-15.1912.

' Patented Dec. 11,1917.

16 SHEETSSHEET I4.

J. L. WRIGHT.

TELEPHONE EXCHANGE SYSTEM.

APPLICATION FILED NOV. 11, 19:2.

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APPLICATION FILED NOV- ll, 1912.

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tion.

pniiinn snares: rarnnr orricn JOSEPH L. WRIGHT, OF CLEVELAND, OHIO, ASSIGNQR, BY; MESNE ASSIGNMENTS, TO

JAMESR; GARFIELD, TRUSTEE,

OF. CLEVELAND, OHIO.

TELEPHONE-EXCHANGE SYSTEM.

Application filed November 11, 1912-.

' have invented certain new and: useful, Im-

provements in Telephone-Exchange Systems,- of which the followingis a specifica- My invention: relates to telephone exchange systems, known asv semi-automatic. In systems of this type automatic switches are used for interconnecting the subscribers? lines. The switches theI-nselwesarecontrol'ledby an op: erator' who is provided with a. suitable. im-

pulse device or hey-board.

The ob ect of my present invention is tof provide means for operating a system of the semi-automatic class in COI-llUllGtlOIl with manual exchanges. In the present instance.

the automatic switching mechanism for interconnecting the subscribers of the semi:- automatic exchange is located at one point, while theoperators who control it are located: at another point or in the same exchange containing a manual switch-board. The operators controlling the automatic switching mechanism are provided with a key-board and control circuits therefor. The calls originating at the distant semiautomatic exchange are automatically connected to the operators key-board over special control trunks. After a connection is completed, the key-board is automatically disconnected and is ready to be used for other calls.

In trunking from a manual switch-board to the semi-automatic exchange the semi automatic operator is provided with a special control circuit and key-board. A subs scriber in a manual exchange desiring to converse with a subscriber in the semi-automatic exchange gives the desired number to the regular A operator at the manual switch-board who thereupon presses an order wire button leading to the se1ni-automatic operator, who assigns the trunk to be used. This latter operator is provided with a button and signal lamps for each trunk. The signal lamp is lighted when the A operator places the calling plug into the trunk jack associated with this trunk. The lighting of this lamp notifies the semi-automatic operator that the assigned trunk has been taken, by the A, OQBIifigtOIyEt-Ild she vthen Specification of Letters Patent.

and: especially to that class.

Patented Dec. M, 1191?. SeriaLNo. 730,761.

presses a: control button belonging to her key-cset, and the trunk assigned. This operation causes the operators key-board to. become connected to the trunk. The semi-automatic opera-tor new sets her key-board and connects the calling subscriber to the desired subscriber in: the semi: automatic exchange through the automatic switches. As soon as this connection is completed, the semi-automatic operator is disconnected and the A operator at the man ualswitch-board has supervision overand controls. the connection. 1

In trunking from the semi-automatic exchange to a handled as follows: The semi-automatic operator upon receiving a. call from the semi-.

automatic exchange for a subscriber in the manual exchange, presses an order-wire button leading to an operator at the manual switchboard who assigns the trunk to be used. The semi-automaticoperator sets; up

the number of the trunk assigned on her key-board causing a special selector switch to pick out the assigned trunk leading to the manual exchange. hen this trunk is picked out, the operator at the manual switch-board receives a suitable signal associated therewith and completes the connection to the subscriber at the manual exchange in the regular manner, After thetrunk has been picked out, the key-set belonging to the semi-automatic operator is disconnected.

In designing this system special provision has been made in order to render it unnecessary for the calling subscriber to give the number to more than one operator, even though the number of the desired subscriber is in another exchange. This provision has been made in order to conform with customary traffic conditions existing at pres? ent in some of the larger telephone exchange systems.

It will be found after reading the specifications that difierent methods of handling the trafiic can be made without changing the present circuits; Some of these methods will be pointed out later. 7

Another feature of-this invention is the manner in which the operatorof the semi-l automatic exchange, even though located at a distant point can originate and supervise calls; a 1

also: the button associated with up the proper number on manual exchange, the calls are My invention is illustrated in the accompanying drawings wherein,

Figure 1 shows a subscribers line and control circuit at the semi-automatic exchange.

Fig. 2 shows a primary and first selector circuit.

'Fig. 3 shows a second selector circuit.

Fig. 4 shows a connector circuit with party line ringing equipment.

Fig. 5 shows a subscribers line and control circuit at the semi-automatic exchange.

Fig. 6 shows the control circuit for the key-set switches.

- Fig. 7 shows the key-set switch and circuits of the portion at the semi-automatic exchange in which the main switching equipment islocated.

Fig. 8 shows a portion of the key-set circuit located at a distant point.

Fig. 9 shows the operators key-board and sending machine.

Fig 1 shows the arrangement for originating a call in the semi-automatic exchange so as to enable reverting or special calls to be handled.

Fig. 1 shows a line and cord circuit at the manual exchange and a portion of the trunk circuit leading to the semi-automatic exchange.

Fig. 2 shows the trunk located at the semi-automatic exchange terminating in a selector switch.

Fig. 6 shows the control circuit between the trunks from the manual exchange and the key-set switches.

Fig. 3 shows a trunk selector at the semiautomatic exchange.

Fig. 4 shows a trunk from the semi-automatic exchange to the manual exchange terminating in a plug and also a subscribers line circuit at the manual exchange.

Fig. 10 shows the arrangement of the various figures when a subscriber in the semiautomatic exchange calls for another subscriber in the same exchange.

Fig. 11 shows the arrangement of the various figures when a subscriber in the manual exchange calls for a subscriber in the semiautomatic exchange.

Fig. 12 shows the arrangement of the vari- V ous figures when a subscriber in the semiautomatic exchange calls for a subscriber in the manual exchange.

Fig. 13 shows the arrangement ofthe various figures in case a subscriber in the semiautomatic exchange wishes to call some one on the same line.

Referring to Fig. 1, the subscribers station at A is equipped with apparatus usual in common battery systems, and the line wires from this station terminate at the central office in 'a line relay 2.

The line relays are divided into groups,

there being ten groups to each one hundred lines. The group relay 3 The. switch V is common to a group of one hundred lines and rotates in search of an idle primary trunk whenever a call in the group with which it associates is originated.

Referring to Fig. 2 the primary switch G is a two-motion switch and rotates first in a rotary direction until the row contact which designates a group of calling lines is picked out, whereupon the switch ceases to rotate and steps in a vertical direction until the individual test contact is found.

The first selector switch shown at D responds to impulses from the sending device and rotates in order to bring the wipers opposite the proper group of trunks leading to the second selector switches. The wipers 63 of the primary switch C and wipers 56 of the first selector switch D are joined as indicated by the heavy lines for conversational purposes. The condensers 43 and 4A respectively are inserted in the talking conductors. Relays 23 and 24 are connected respectively to ground and battery and serve to furnish talking current to the calling subscriber. Relay 21 is the starting relay for the primary switch C and corresponds to relay 2, Fig. 1, as it controls the action of the operators key-set switch, Fig. 7, in the same manner that relay 2 controls the primary switch C. Relay 22 is the row test relay, while 24 in addition to being a battery sup ply relay also serves as the individual test relay in picking out the calling line. Relay 25 is operated when 'the key-set switch, Fig. 7 picks the trunk and remains energized while the impulses are being transmitted to prevent them being heard by the calling subscriber. Relay 27 is the test relay of the first selector switch and remains energized while the switch is stepping in a vertical direction. and while the test wiper 57 comes into en gagement with busy contacts. Relay 28 is actuated whenever either the rotary or vertical magnets of the primary switch are operated, and also when the vertical magnet of the first selector switch is operated. The circuits of these magnets are normally completed through the back contacts of this relay 28, and so therefore the action set up between this relay and the magnets cause them to operate their respective switches.

The resistance coil 42 is placed in series with the rotary relay 29. This relay receives impulses from the sending device and opcrates the rotary magnet 84 causing the switch D to rotate. The operation of the magnet 34; when it completes its stroke closes its associated contact springs and places ground the called estates between the coil 42 and the winding of the relay'29, thus shunting'out relay 29 and dis sipating any static charge on the conductors leading to the exchange in which the sending device is located. This arran ement dis-v penses with the necessity for fine adjustment between the repeating relay and the magnet which it controls, for as soon as a magnet completes its work, the repeating relay is at once shunted out and all residual magnetism thereby dissipated.

Referring to Fig. 3, the second selector switch E is operated in the same manner as that of the first selector at'D. It first moves in a rotary direction to pick out the group of trunks leading to connector switches and then in a vertical direction to pick out the idle trunk in the group. Relay 81 is the rotary repeating relay and is regulated by the action of the rotary magnet 85 and the resistance coil 86. 82 is the interrupter relay corresponding to relay 28, Fig. 2. 83 is the test relay, while relay controls the release of the switch E.

Referring to Fig. 4, the connector switch G is provided with the wipers 390 for offecting connection with'the called line and when so connected places the line cut-01f relay in series with the sleeve relay 325. Belays 305 and 310 are the repeating relays and respond to impulses from the sending device. The resistance coil 370 is common to the winding of both relays and serves to regulate them in conjunction with the stepping magnets of the switch G and the stepping magnet 360 of the switch F. Relays 315 and 330 are looking or control relays. Relay 3 10 is the ringing relay and is operated when the connection is completed by means of the commutator 370. .Relay 320 is the tip battery supply relay and responds when the called subscrlber removes his receiver. Re-

lay 345 is the busy test relay and is only actuated when a busy line is found. The action of this relay at this time closes the circuit of the release magnet 365 and connects a suitable busy tone test to the calling subscriber.

The controlling or party line distributing switch is shown at F. The contacts and wiper of the portion J cut on the generators 356, 357, 358 or 359 depending upon the number of impulses transmitted by the sending device. Thecontacts and wiper of the portion I serve to restore the switch to its normal or idle position. The contacts and wiper of the portion H serve to render the connector switch busy after the called party has answered'by connecting ground to the 60 test wire 306. The wiper and portionl l also serve to restore the switch G after the called party hangs up his receiver, or in case the cal-ling party hangs up his receiver when party fails to. answer his telephone.

Fig. 5. shows the same equipment as in Fig. 1 and need not be described.

Referring to Fig. 6 the switch shown at Y corresponds to the switch W, Fig. 1, and serves to pick out an idle operators key-set switch. The switch X is a time element control switch and only comes into action when the relays 130 and 132 have beenlield energized beyond the maximum time limit. The relay 132 is energized as soon as the idle key-set switch is picked out and should only remain energized long enough for the keyset switch, Fig. 7, to pick out the tenth contact in the tenth row. The magnet 7 7 causes the switch X to operate at each rotation of the sending device. The rotation of the sending device closes contact springs36.

We will assume that the relays 132 and 130 have been held energized beyond the maximum time and the switch X is rotating. When thewiper :0 reaches one of the contacts connected to the wire 139 the circuit of relay 78 is closed to ground through the contacts of relay 132. The switch X continues to step once at each rotation of the sending device and when the wiper 02 reaches one of the contacts to which relay 76 is connected this latter relay operates and performs the following functions: Battery is placed on the wire 149 through the wiper and contacts of the lower bank of the switch W, Fig. 1, to wire 260 operating the release magnet-32 causing the switch C to restore. Ground is also placed on wire ltl-through the lower bank contacts of the switch Yto the release magnet 166 of the switch M, Fig. 7, causing the key-set switch to restore. Ground is also placed on the wire 1 18 leading to the stepping magnet 7 of the switch W, Fig. 1, through the contacts of relay 5, thereby causing this switch to step forward one contact.

If the calling subscriber is connected to a primary switch 0 and a faulty connection takes ,place between this switch and the switch M, the connection is at once released thereby preventing his call being tied up. As soon as the connection first established, or partly established is released, then another primary switch or key-set switch will start to complete the connection.

The switch X performs no functions in connection with regular calls and only comes into play in case of an abnormal condition.

Referring now to Fig. 7, the key-set switch M acts in the same manner as the primary switch C, Fig. 2, as it first rotates to pick out the group in which the calling trunk is located and then steps in a vertical direction to pickout the individual contact in the group. The tip and sleeve conductors 150 and 151 respectively are connected to the tip and sleeve conductors,Fig. 2,by wipers 167. Relay 153 is the row test'relay andis connected to the row testwiper 168.

'40 lays 157 and Relay 154 is the individual test, relay. Relay 152 is the starting relay and is energized as soon as the switch Y, Fig. 6, picks out the idle switch M. Relay 163 is the interrupter relay actuated by the rotary and vertical magnets 165 and 164. Relay 179 is energized as soon as the row test relay 153 is energized and connects one terminal of relay 180 to battery after relay 152 is deenergized, the other terminal of this relay 180 is connected permanently to the-tip conductor 150. Relay 190 has its circuit completed after the switch M rotates and after relay 152 becomes deenergized. The energizing of relay 190 at this period places the relay 173 in series with relay 156, Fig. 8.

The three conductors 150, 151 and 175 errtend to the key-set circuit located at a distant exchange. The impulses are transmitted over, the conductors 150 and 151, while conductor 175 serves for signaling and release purposes.

The relay shown at 700 is a control relay and is used by the operator who handles calls from; subscribers in the manual exchange to subscribers in the semi-automatic exchange. The only difierence between the circuits of the various key-boardsis the addition of this special relay and in fact, all

ofthe key-boards could be provided with this. control circuit. The only function performed over this circuit is to open or close the starting circuit of the relay 152, Fig. 7. The details in connection with this circuit will be brought out in describing a call from the manual to the semi-automatic exchange. Referring to Fig. 8, relay 156 is the signal relay and when actuated closes the circuits of the signal lamps 243 and 244, Fig. 9. Re 162 are connected in series and serve for starting a call when the button 247 is pressed. Relay 155 is the listening relay and when actuated by the button 248 being pressed connects the operators telephone v set'across the tip and sleeve conductors 150 and 151. The action of relay 155 disconnects relay 156. Relayfl185 is the interrupter relay for, the magnet 161 which controls the shifting switch shown at portions N, O and P. Relay 158 is the release relay and comes into action after all the impulses have been transmitted. Relay 159 is used for trunk calls and controls the action of the shifting switch so that fortrunk calls fewer rota tions of the sending device are required. The stepping magnet 161 is operated once at each rotation of the sending device and cuts on the impulses from the key-board and sending device in a predetermined order as follows: 'At' the firstrotation'impulses corresponding to the thousands are sent over the tip side of the trunk. At the second rotationa single test impulse is sent over the sleeve side of the trunk. Atthe third rotation; impulses corresponding to the hunmasses dreds are sent over the tip side and at the fourth rotation a single test impulse is sent over the sleeve side of the trunk. fifth rotation selective ringing impulses are sent over the tip side of the trunk and at the sixth rotation the tens impulses are sent over the sleeve side of the trunk. At the seventh rotation the units impulses are sent over the tip side and at the eighth rotation impulses a single test impulse is sent over the sleeve side of the trunk. At the next rotation of the sending device the wiper of the portion P passing over the bank of contacts closes the circuit of relay 158 causing the shifting switch to rapidly rotate until it reaches its normal position. The energizing of relay 158 disconnects relays 157 and 162, thereby causing relay 173, Fig. 7, to fall back and close the circuit of release magnet 166 and restore the switch M to its normal position. The relay 180, Fig. 7, is operated at the first impulse sent over the tip side of the trunk 150 and in acting opens the circuit of relay 179, and this relay acting in this manner opens the circuit of relay 180 itself. It will be noted that after the first impulse has been sent, relays 180 and 179 are. disabled.

The operators key-board shown in Fig. 9 consists of five rows of buttons, each row having ten buttons. Number 1 button of each row is connected to a contact operated by the cam 232. Number 2 button of each row is connected to a contact operated by the cam 233. The corresponding buttons in each row are connected to similar contacts. The contact controlled by the cam 232 is closed just long enough to keep relay 160, Fig. 8, energized, while one impulse is being transmitted by the commutator 242. If number 10 button is down, relay 160 would be closed by the cam 241 just long enough for ten impulses to be transmitted by the commutator 242. The contacts of the commutator 242 are connected directly to the normally open contact of relay 160 and when this relay is energized, the impulses are connected to either the tip or sleeve side of the trunk, depending upon the position of the arm of the portion N. The buttons or keys shown in these five rows, Fig. 9, are of the usual locking and indicating type. hen any one button of a certain row is depressed it will release the button formerly depressed. The buttons 246, 247 and 248 are of the nonlocking type.

' Referring to Fig. 1 the wires 412 and 413 lead to the selector switch at DD, Fig. 2". In order to originate a call, the operator simply throws the key 665 forward, thereby connecting the retardation coil 675 and the relay 670 to the conductors 412 and 413. This originates a call and causes this trunk circuit to become connected to a key-board. When this'connection is established, the op- At the 

